人体严重急性缺氧耐力的评定

The Evaluation of Tolerance to Serious Acute Hypoxia in Humans

15名男青年吸含氧7.1%的低氧混合气进行缺氧耐力检查,用倒序书写数字的方法测量了有效意识时间,词时记录了睁眼脑电。我们发现,额导脑电图出现阵发性长程高幅δ波的时间同用书写方法测量的有效意识时间的终点很接近。在有效意识时间之后继续缺氧进行了听觉检测,其反应时比对照值延长了一倍。有效意识时间终点的潮气末氧分压为4.0±0.2kPa。在此后1分钟,潮气末氧分压为3.7±0.2kPa,这时受试者仍能用电钮回答声音信号,该数据对应急救生有重要意义。

15 young men breathed gas mixture containing 7.1% oxygen thatsimulated hypoxia at 7500m altitude to examine the tolerane to hy-poxia.Time of useful consciousness (TUC) was measured with a me-thod of letting the subjects count cown by writing while recording theirvigil EEGs.We found that the ti e when paroxysmal wave trains oflong range and high amplitude emerged in frontal EEG was close tothe TUC measueed by the method of writing.After the measurementof TUC,as auditory test under simulated hypoxia was conducted.Theaverage response time was twice as much as that of control.At the ter-minal of TUC,the oxygen partial pressure at tidal end in expiredgas was 4.0±0.2kPa.In one minute after that,this partial pressurebecame 3.7±0.2kPa.At this time the subjects could still reply to soundsignals using push botton.The retults were very significant toemergency rescue